31274628 has 144 divisors (see below), whose sum is σ = 97598592. Its totient is φ = 7603200.

The previous prime is 31274623. The next prime is 31274651. The reversal of 31274628 is 82647213.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (31274623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 172698 + ... + 172878.

It is an arithmetic number, because the mean of its divisors is an integer number (677768).

Almost surely, 2^31274628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31274628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48799296).

31274628 is an abundant number, since it is smaller than the sum of its proper divisors (66323964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31274628 is a wasteful number, since it uses less digits than its factorization.

31274628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 221 counting only the distinct ones).

The product of its digits is 16128, while the sum is 33.

The square root of 31274628 is about 5592.3723052029. The cubic root of 31274628 is about 315.0629856412.

The spelling of 31274628 in words is "thirty-one million, two hundred seventy-four thousand, six hundred twenty-eight".